Frederick Ferdinand of Anhalt-Köthen (25 June 1769, Pless – 23 August 1830, Köthen) was a German prince, Ascanian ruler of the principality of Anhalt-Pless and, from 1818, of the duchy of Anhalt-Köthen. He was the second son of Frederick Erdmann, Prince of Anhalt-Pless, and his wife, Louise Ferdinande, daughter of Henry Ernest, Count of Stolberg-Wernigerode.

Choose your answer: based on the paragraph above can we conclude that "Frederick Ferdinand was the duchy of Anhalt-Pless"?

pick from the following.
 --Yes.
 --It's impossible to say.
 --No.
I think the answer is
No